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All the above, on crypto, if bitcoin goes down all goes down, if bitcoin goes up it all goes up, hence diversifying doesn't really matter as much as it does in stocks.
The word that I bolded above is the real fact and that is true,
the price is going up because the price is going up. No need to diversify other altcoins because is that just the same. It will go up when bitcoin goes up, so now, let's get to focus on Bitcoin. Altcoins diversification is not advisable since we don't know when the price going up, they are swinging their prices when Bitcoin price moved. Let's just give full attention to Bitcoin and altcoins is our second option to choose.